Improvement in safety-valve



their sans `SAMUEL BODEN, OF LOUISVILLEgKENTUCKY.'

Lem/rs Patent No. 90,226, dazed May 1s, 1869.

IMPROVEMENT IN SAFETY-VALVE.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern Be it known that I, SAMUEL BODEN, of the city of Louisville, in the county of Jefferson, iu the State of Kentucky,4 have invented certain new and valuable Improvements u Steam-Boilers, to prevent the bursting and collapsing thereof; and I do hereby declare that the following is a full and exact description thereof, reference' being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in providing a steam-boiler with one or more valves, for the escape of steam, in addition to the'ordinary safety-valve, and iu constructing the additional valve to open downward or within the boiler, or steam-drum, and of much larger area than the other, and ordinary safety-valve, and in so arranging both valves that ,both may open at once, for the escape of steam, or that the additional valve may be opened independent of the other, by being forced down by atmospheric pressure, in Vthe event of the creation of a partial vacuum in the steamdrum, or boiler, by any cause, and thus preventing a collapse, in the rst place, and a bursting, by the resulting reaction, in the second place.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construc- 'a side view of the valve-rods C and D, the adjustable fulcrum H, lever h, weight P, and other parts.

Figure 2 represents an end view.

Figure 3, a top view.

The steam-drum E has the form shown in the drawings, with a port, or opening at the end, marked G', and another end, about twice as large, marked G.

This larger valve is located in the inside of l the drum, or boiler, and is seated up against the top of the drum, while the smaller valve is located upon the outside, and has its seat upon its opening.

-The valve-rods C and D are held in their positions perpendicular to their respective openings, by the capsl y ures.

rllhe stem f is in two parts. The/upper end of the lower part, and the lower end of the upper part are within the nut g, and each has u ponfita convex screwthread, one a left, and the other a right-hand thread, and the nut o is formed with correspondiugconcave threads, so that, by turning the nut to the right or left, the stem may be lengthened or shortened, as may be desired.

The upper end ofthe valve-rod D is connected with the link Ir, by a loose joint at c.

The stem e, of the fnlcrum H, is constructed to form a loose joint with the clevis b.

The lever h, before being` bolted to the link a, may be passed through .the clevis b, and then through the link r. Y

The levis b may be fastened at any pointV of the lever h, by turning the set-screw t, and the lower end of thc fulcrum H may be fastened, at any point on the slotted bar J, by turningthe nuts It k.

The openings in the link r are made considerably longer than the lever It is Wide, in order that the end l of the levery may have room to play up and down therein, but, in order to regulate that play, the top of the link is made with a circular opening in it, Aand in that ,opening is placed a spiralV spring, p, and that spring is held in its place by a set-screw, o.y

On the other end of the lever maybe placed a common pea-weight, P, which may be fastened, at any point desired, byaset-screw through the top or side of the weight.

The movable fulcrum H, its convenient form andy structure, enables the engineer to place the fulcrum under the lever, at any desired point, with quickness and facility.

In case of anysudden and undue increase of steam, the valve G would be raised, and the raising of that end vof the lever would, of course, depress. the other, which rests uppn the solid bottom of the link r, and thus would force downwards the larger valve G, and would atl'ord instant relief Y to the boiler, by allowing the steam to escape by its port also, and this movement would be greatly aided b'y the atmospheric pressure upon the upper surface of that valve.

"On the other hand, in case of any. sudden creation of a vacuum, or a partial vacuum, within the boiler, by any cause, while the atmospheric-pressure would 'hold the smaller valve Gr firmly in its seat, and closed, it would force the larger valve downwards, and open its port for the admission of the air. rDhe 'spring iu the top of the link fr would close the valve G, so soon as the vacuum was destroyed, and then, in case of asudden and undue increase of steam, at the instant of the closing of that valve, the valve G would open, and,

by the action ofthe lever, would open thelarger valve also, so that the steam would escapeat the same time through both.

It is obvious, from the foregoing description, that the fulcrum H may be so adjusted that the steam, at a given degree of pressure, will be just suiicient, or more or less than suicient, to raise the small valve, and depress and open the large one, notwithstanding the pressure of steam upon the under side tendingto hold it closed up against the seat.

YWith my construction and operation of these two` valves, the collapse, or bursting of the boiler is rendered almost impossible. But, if deemed necessary, two, or even moreadditional valves may be used, for the same purpose and inthe same manner.

The supply of steam in a boiler may become either excessive, or deficient from various causes, and in either ease it is injurious to property. We know from experience that the shellsof boilers do collapse,

and in many instancesof collapse we are unable to' the boiler, the weight of the atmosphere, of' about tiff teen lpoundsto the square inch, would not injure, or

collapse it, yet, as before stated, boilers Vare collapsed by the weight, or pressure of the atmosphere. This is generally when a vacuum, or partial vacuum Ais suddenly created, by any cause, such as the condensation of the steam within it, or the blowing olf, and condensation at the same time. v The suddenness of .the pressure' seems to produce this effectthe eieot of a blow struck.

In -case of the introduction of an excess of cold water, the portion' of the boiler coming in immediate contact with the water would be reduced in tempera? ture much below the remaining part, andthis inequality would itselfiuerease the tendency to collapse.

y But, as before intimated, I may not be able to eX- plain the reasons of collapse. I do, however, by my additional valve, aiord an unfailing remedy.

What I claim as new, and desire to secure by Letters Patent, is--l y 1.k 'I he valve-rod D, with its slotted link rr, adjustable connecting-nut g, spring p, set-screw o, loose joint c, and valve G, constructed, combined, and arranged substantially as herein set forth.'

2. The arrangement ofthe foregoing'stated elements with the lever 7i, adjustable bearing b, and fulcrumstandard H,.connectinglink a and stem d, valve G', and weight P, substantially as herein set forth.

- SAMUEL BODEN. Witnesses WM. B. KENNEDY, J ONATHAN MoKELvEY. 

